Ganapathy was arrested by the Directorate of Vigilance and Anti-Corruption on February 3 for allegedly accepting Rs 30 lakh as bribe from an aspirant for the post of an assistant professor.
He is lodged in the central jail along with professor Dharmaraj who allegedly brokered the deal.
Based on a petition by DVAC, the court of Prevention of Corruption Act special Judge John Mino allowed police five days custody of Ganapathy for questioning on February 12.
As the custody period ended, Ganapathy was produced before the judge, who extended his judicial custody till March 3.